| 摘要 |
A switch-locking mechanism in a screw tightener in which a motor for rotating a driver bit is activated by pulling a trigger, includes: a mating projection provided on the trigger; a trigger block slidably accommodating the trigger in part such that the mating projection of the trigger is positioned in the trigger block, the trigger block being fixed to the screw tightener body; a first spring urging the trigger in a opposite direction to the trigger pulling direction at all times; and a slide locker operative in a direction perpendicular to the trigger pulling direction, the slide locker having a locking projection movable in and out the moving locus of the mating projection of the trigger.
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